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What about using washers and some copper grease to lift those plugs a few mm?
A 3 mm thick washer would add about 1 cc(*), that's more than you can get by chopping the thread.
At 333 cc per cylinder and a (guesstimated) compression ratio of 11:1 that would reduce the compressed chamber area (of 30.3 cc) by 3.3 %; it would reduce the compression ratio to about 10.6:1.
And when it gets really cold and your car does not start well anymore you can still just get the washers off and get moving again.
(*) of course that depends on the thread width. Assuming 18 mm here.
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
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Last edited by RedDevil; 08-17-2014 at 04:57 PM..
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